Dublin business leaders are warning that construction works for the Metro North could put up to 5,000 jobs at risk.
But the Rail Procurement Agency says it will be drawing up a management plan to minimise disruption before the issue goes before An Bord Pleanála next year.
The Dublin City Centre Business Association claims people do not realise the extent of the disruption due from Metro North.
It cites the fact that O'Connell Street will be dug up for 18 months and up to 200 trucks a day will be taking soil from the tunnel.
DCBA wants the RPA to stick to tunnelling instead of cut and cover and to consider a stop on Marlborough Street instead of two subway stations in the O'Connell Street area.
The RPA says it will consider tunnelling as much as it can but says the present route is the best available.
The RPA points out that An Bord Pleanála is due to consider the issue next March.
